If you are sharing data either by using your own Raspberry Pi built receiver or FR24 provided, you are entitled to a complimentary Contributor plan for as long as you continue to share data.
If you are about to start sharing data and currently own a paid Flightradar24 subscription, please make sure to cancel it - otherwise you will get charged continuously, and the free Contributor plan will not get activated automatically.
The paid subscription does not get cancelled automatically when you start sharing data - the cancellation has to be done manually on the platform you have purchased the subscription on.
>>> If you already have an account, it will automatically be upgraded to the Contributor plan as soon as we start receiving data from your feed.
>>> If you don't have an account yet, simply sign up for a Free account and do not start any paid trials: https://www.flightradar24.com/premium/signup
As soon as you start feeding data, an already created Free account will get upgraded to the Contributor plan automatically. You may need to log out and in again.